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Cash and cash equivalents and Investments and Additional information on the consolidated statements of cash flows - Main non-cash operating transactions (Details) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Main non-cash operating transactions: |  |  |
Offsetting of capitalized trade receivables of Tuves Paraguay acquisition | $ 149 |  |
Offsetting of tax on personal property - on behalf of Shareholders |  | $ 8 | $ 15
Income tax offset with VAT and internal taxes |  |  | 50
Offsetting of other receivables with regulatory provisions | 1 | 27 |
VAT offset with income tax payments |  | 54 |
SAC acquisitions offset with trade receivables | $ 313 | 305 | $ 212
Other receivables of PP&E sales offset with trade payables |  | $ 25 |

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- Definition The amount represents the offsetting of capitalized trade receivables on Tuves Paraguay acquisition. + References No definition available. + Details
Name: | teo_CapitalizedTradeReceivablesOffsettingOnAcquisition
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition No definition available + References No definition available. + Details
Name: | teo_CashFlowNoncashOperatingActivitiesAbstract
Namespace Prefix: | teo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount represents the income tax offset with VAT and internal taxes. + References No definition available. + Details
Name: | teo_IncomeTaxOffsetWithVatAndInternalTaxes
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount represents the provisions offset for other receivables. + References No definition available. + Details
Name: | teo_OtherReceivablesOffsetWithProvisions
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of receivables from sale of property, plant and equipment offset with trade payables. + References No definition available. + Details
Name: | teo_ReceivablesFromPropertyPlantAndEquipmentSalesOffsetWithTradePayables
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount represents the offset of subscriber acquisition costs with trade receivables. + References No definition available. + Details
Name: | teo_SubscriberAcquisitionCostsOffsetWithTradeReceivables
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount represents the offsetting of tax on personal property, on behalf of shareholders. + References No definition available. + Details
Name: | teo_TaxOffsettingOnPersonalPropertyOnBehalfOfShareholders
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount represents the VAT offset with income taxes. + References No definition available. + Details
Name: | teo_VatOffsetWithIncomeTaxes
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration